Sunway Solar Solar Car Battery Trickle Charger & Maintainer 5W Solar Panel Power 12V Charger kit Waterproof for Car Automotive RV Marine Boat Truck Motorcycle Trailer Tractor Powersports Snowmobiles

I've had alot of problems with car batteries. I don't drive much anymore and the battery looses power. Since I put in this charger, I have had no problems. I hang it in the south facing passenger window and plug it into the cigarette lighter. Never have had a problem since. Some chargers won't produce enough wattage if inside the car. I tested this device with a volt meter and only lost half a watt by putting it inside the car.

These work great on my jet ski batteries! Ensures a solid start. Plus I added a deadman switch that disconnects the negative terminal from the ski circuit.

Seems to work fine, putting almost 15 volts out measured at the cable end. Mounted inside my windshield with truck facing early morning sun, it brought a battery at 12.1v up to 12.5 v. Sun lasts about four hours before going over the top of the truck. So about four more hours of shade with bright sky light only on the panel. Only issue is there are two batteries on my diesel Ram pickup and the other (passenger side) battery is not getting any voltage. I am charging through the power port. Looks like I have to use the alligator clips on that one and keep both charged by moving the clips to the other battery every day or so. It would be nice to have a splitter so I could plug into the power port and have another wire long enough to go past the door moulding and into the engine compartment to the second battery. Or a splitter with two sets of clips, each long enough to reach the batteries. Not use the power port. One wire could be longer than the other because I mount the panel on the lower driver side of the windshield. I will experiment by letting the batteries go down a bit and hook up the charger clips to the passenger side battery and see if the voltage reaches the driver side battery too. I don't know how these batteries are connected. The suction cups are easy to lose. They are not very secure, especially if the panel is mounted vertically. Be careful if you move the panel a lot.

I'm been using this on my '06 Powerstroke pickup for a while now. I sometimes don't drive the truck for 2-3 weeks, and the batteries (dual) would be marginal after sitting for so long. This little solar panel keeps up with that parasitic loss, so it starts good after a long sit. I just lay this on the dash, with the windshield facing southwest. I don't even bother with the suction cups, just lay it flat on the dash. Works fine. Don't expect it to charge your weak battery. Driving will charge your battery, then this little device will keep them fresh for as long as you want.

This is the second one I purchased, they work as expected keeping the battery topped off.

I used this on my second car in the hopes of maintaining the battery pending a sale, and ended up having to replace the battery because this was useless and the battery died. The car was parked outdoors in full sun all day, every day, but the charger did not manage to produce enough power to keep the battery alive. The wires are also the cheapest quality possible. I snagged one accidentally on the trunk, and it snapped in half with barely any force. AVOID.

Works great on cars and lawn tractor. Keeps batteries fully charged when equipment is not in operation. Shipping was quick.

Most of the time, these seem to keep 12V car batteries charged up, but even with constant direct sunlight, every so often it seems to drain the battery instead of charge it.. I've got 2 of these 5W units installed on vehicles I don't drive much and stay parked outside. Not sure what causes them to flake out and drain the battery every so often but it happens, and then I have to jump them. Not as reliable as a battery tender that is plugged in to line power.